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FDTD Computation of Space/Time Integrated Electromagnetic Lagrangian: New Insights into Design of Mutually Coupled Antennas

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posted on 2022-02-11, 17:51 authored by Debdeep SarkarDebdeep Sarkar, Yahia Antar
In this paper, we develop a formalism based on electromagnetic Lagrangian which provides new insights about the near-field reactive energy density around generic antennas for arbitrary spatio-temporal excitation signals. Using electric and magnetic fields calculated via FDTD technique and interpolation routines, we compute the EM Lagrangian density around antennas (thin-wire dipoles and Yagi-Uda Arrays). Spatial maps of time-integrated EM Lagrangian density sheds light onto the capacitive/inductive nature of reactive energy density distribution around antennas and highlight its inherent connection with inter-element mutual coupling.


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in IEEE Journal on Multiscale and Multiphysics Computational Techniques